Ariana Grande feels that "a lot can change" between the ages of 19 and 21. And she is absolutely right!

A year after scoring a performance slot during the MTV Video Music Awards pre-show, the 21-year-old platinum-selling artist has been tapped to open the whole thing this Sunday.

"To go from performing on the pre-show last year to opening the VMAs this year is utterly insane—and just too crazy to process," Grande, who was sporting sparkly cat ears for our sit-down, told E! News yesterday. "And I feel like I won't actually process it until after it happens, and then I'll process it as I'm watching it, and then I'll be l like…[whoa] OK, that happened."

Grande will be performing "Break Free," off of her latest album, My Everything, which drops Aug. 24. She will also be teaming with Jessie J and Nicki Minaj on their hit "Bang Bang" during the show.

Also a must-listen off of My Everything? The ballad that Harry Styles co-wrote for her, of course! Grande told us that she "loves" the song, "A Little Bit of Your Heart," calling it "really beautiful."

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